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KB5120714: Overview with user sentiment and feedback

Last Updated September 15, 2026

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Overview

KB5120714 is a cumulative security and reliability update for .NET Framework 3.5 and 4.8.1 on Windows Server 2022, released August 11, 2026. The patch addresses six security vulnerabilities including elevation of privilege and remote code execution issues. This is a recommended update for regular maintenance routines on affected Windows Server 2022 systems running the specified .NET Framework versions.

General Purpose

  • Addresses six critical security vulnerabilities (CVE-2026-65810, CVE-2026-62872, CVE-2026-62886, CVE-2026-62897, CVE-2026-70354, CVE-2026-62902)
  • Fixes elevation of privilege and remote code execution vulnerabilities in .NET Framework
  • Includes information disclosure vulnerability remediation
  • Delivers cumulative reliability improvements for .NET Framework components
  • Recommended for deployment as part of standard security maintenance

General Sentiment

This patch addresses significant security concerns and is recommended by Microsoft for regular deployment. However, two confirmed known issues affect WPF applications, particularly those handling font rendering and XPS document processing. The issues are documented with workarounds available, and Microsoft indicates resolution is available in subsequent updates. The security-focused nature of this update outweighs the application-specific compatibility concerns for most environments.

Known Issues

  • WPF applications may fail with System.IO.FileFormatException when printing or generating PDF/XPS content using certain fonts including Calibri; workaround available via AppContext switch (resolved in September 2026 update)
  • WPF applications printing from in-memory XPS documents registered with System.IO.Packaging.PackageStore may fail with System.IO.FileFormatException when using pack scheme URIs; workaround available via AppContext switch or code modification (status: investigating)

Disclaimer: We take measures to ensure that AI-generated content is of the highest possible quality, but we cannot guarantee its accuracy and recommend that users do their own independent research. Generated on 2026-09-15 07:13 AM

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